Sapphire crystal: why it's the only acceptable choice for a quality watch
You don't think about a watch crystal—until it gets scratched. After that, it's hard to ignore.
Mineral Glass: The Standard for Entry-Level Watches
Cheap to produce, it's easily scratched by everyday objects. Within 18 months, the surface becomes cloudy. The watch permanently loses its brilliance.
Sapphire Crystal: The Choice for Serious Watches
Synthetic sapphire measures 9 on the Mohs scale—diamond is 10. In practice, nothing in your daily life can scratch it. It remains as clear on the first day as it does five years later.
What A★Star Chose
All our watches are equipped with a double-sided sapphire crystal with anti-reflective treatment—on the inside AND outside. The result: perfect readability in direct sunlight, under artificial lighting, or at night.
The case back is also made of transparent sapphire crystal, allowing you to observe the NH35 movement in operation.
This choice is more expensive. A watch worn every day deserves it.
A★Star — Born in the dark. Made to shine.
